【Instant purchase OK】 This is the BBE FREQ BOOST. This is a treble booster. Treble boosters come in two main types: those that boost only the treble (mid-high frequencies), and those that add fuzz-like distortion characteristics, increasing the sustain. The Freq Boost has a feel that's right in the middle, boosting the cutting mid-high frequencies while adding some overtones for a biting sound that also responds well to the guitar's volume control. Even though it uses an op-amp, it has a vintage-like sound, and the sound quality can change if a buffer is placed before it. When used with distortion, whether with single-coil or humbucker pickups, it has a powerful sound, resulting in a rock-like distortion sound. The boost amount is quite large, and it can be used with any guitar. It is currently discontinued, so it is considered a relatively rare item. The back cover is broken and has been repaired with tape, but there are no issues with the operation, and it works fine with an adapter. Of course, it also works normally with batteries. - Brand: BBE - Model Name: FREQ BOOST - Connection Type: INPUT - Power: 9V DC Thank you for viewing.